Calculator with handwriting pad

This application is a Continuation-in-Part of the U.S. application Ser. No. 18/739,704 filed on Jun. 11, 2024, and entitled “CALCULATOR WITH HANDWRITING PAD”, the entire disclosures of which are incorporated herein by reference.

The present invention relates to the technical field of calculators, in particular to a calculator with a handwriting pad.

When practicing arithmetic skills, a user usually calculate the required value on a notebook. After calculation, the user will use a calculator for verification. Moreover, when the user has a large amount of data to calculate, a simple record of the data will be made in advance, so as to facilitate subsequent calculations by the calculator. In this case, the user need to find paper, a pen, and a calculator for operation, but these tools are scattered and require the user to obtain them one by one, which is relatively cumbersome. Moreover, the paper, the pen, and the calculator are inconvenient for the user to carry and store when the user goes out.

The main purpose of the present invention is to provide a calculator with a handwriting pad for solving the problem of cumbersome and inconvenient carrying and storage for users caused by existing calculations requiring finding paper, a pen, and a calculator and obtaining them one by one.

In order to solve the above-mentioned technical problem, a technical solution is provided by the present invention.

A calculator with a handwriting pad, includes a main body and a handwriting pen for being operated by a user, the handwriting pen is detachably arranged on the main body; the main body is provided with a control module, a button module group for being operated by the user, a display electrically connected to the control module, a liquid crystal display (LCD) screen, and a clear switch. The control module performs a mathematical operation when the user operates the button module group and displays an operation result through the display; the LCD screen is configured to adapt to the handwriting pen for writing use; the clear switch is configured to be operated by the user and generate a clear signal; and the control module is configured to receive the clear signal and clear, according to the clear signal, content displayed on the LCD screen.

Furthermore, the main body is further provided with a locking switch electrically connected to the control module; the locking switch is configured to be operated by the user and generate a locking signal; and the control module is configured to: receive the locking signal and lock the content displayed on the LCD screen.

Furthermore, the clear switch is a Hall switch; an end of the handwriting pen is provided with a magnetic field magnet for generating a magnetic field; and the Hall switch generates a clear signal when detecting the magnetic field.

Furthermore, a battery is further arranged in the main body; and the control module is electrically connected to the battery.

Furthermore, the control module includes a power circuit and a boost module; the power circuit is respectively electrically connected to the battery and the boost module; the boost module is respectively electrically connected to the clear switch and the LCD screen; when the clear signal transmitted by the clear switch is received, voltage input by the power circuit is output to the LCD screen after being boosted, to clear the content displayed on the LCD screen.

Furthermore, a receiving slot is provided in the main body; the battery is arranged in the receiving slot; and the battery is electrically connected to the control module through a conductive sheet.

Furthermore, a pulling element is detachably arranged on the main body; the receiving slot is located on the pulling element; the pulling element is provided with an elastic element on one side of the receiving slot; a fixing block is arranged on the first elastic element; a first fixing slot is provided in a position, corresponding to the first fixing block, on the main body; the first fixing block is arranged in the first fixing slot when the pulling element is mounted on the main body; and the pulling element is fixed on the main body through a screw on the other side of the receiving slot.

Furthermore, the button module group is located below the display, and the LCD screen is located beside the button module group.

Furthermore, the main body includes a front housing and a bottom housing connected to the front housing to form a cavity; the button module group, the LCD screen, the clear switch, and the display are all arranged on the front housing; the control module is arranged in the cavity; and the handwriting pen is detachably arranged in one of the front housing, the bottom housing, and the cavity.

the control module includes a first circuit board electrically connected to the display, a button module group, the clear switch, and a handwriting pad screen, respectively; the first circuit board, the display, and the button module group are arranged on the calculator unit; the handwriting pad screen is arranged on the handwriting pad unit; the clear switch is arranged on the handwriting pad unit or the calculator unit; when in a storage state, the handwriting pad unit and the calculator unit are arranged in an overlapped manner from up to down; and when in an unfolded state, a surface of the handwriting pad unit is horizontally arranged side by side with the calculator unit. Furthermore, the main body includes a handwriting pad unit and a calculator unit; the handwriting pen is detachably arranged on the calculator unit or the handwriting pad unit; the handwriting pad unit is connected to the calculator unit;

Furthermore, the handwriting pad unit is rotationally connected to the calculator unit.

Furthermore, at least one first rotating part is arranged on the handwriting pad unit; a second rotating part is arranged on the calculator unit for use in conjunction with the first rotating part; and the first rotating part is connected to the second rotating part through a shaft rod.

Furthermore, the calculator unit is provided with a first limiting part at a position away from a rotational connection with the handwriting pad unit; the handwriting pad unit is provided with a second limiting part at a position away from a rotational connection with the calculator unit; and the first limiting part and the second limiting part are detachably connected to each other.

Furthermore, the first limiting part is a first magnetic attraction element; the second limiting part is a second magnetic attraction element; and the first magnetic attraction element attracts the second magnetic attraction element when the handwriting pad unit and the calculator unit are in the storage state.

Furthermore, the calculator with the handwriting pad further includes a flexible connection wire, the calculator unit is provided with a first wiring hole on one side close to the handwriting pad unit, and the handwriting pad unit is provided with a second wiring hole on one side close to the calculator unit; one end of the flexible connection wire is electrically connected to the control module after passing through the first wiring hole; and the other end of the flexible connection wire is electrically connected to the handwriting pad screen after passing through the second wiring hole.

Furthermore, a side wall of the first wiring hole and/or a side wall of the second wiring hole in a lengthwise direction are/is smooth curved surfaces; a total sum of a distance between a bottom surface of the first circuit board and the first wiring hole, a width of the first wiring hole, a distance between the first wiring hole and the second wiring hole, a width of the second wiring hole, and a distance between the second wiring hole and the LCD screen is a first length; after a part welded to the first circuit board and a part welded to the LCD screen are removed from the flexible connection wire, a remaining length of the flexible connection wire is greater than the first length.

Furthermore, the control module further includes a second circuit board respectively electrically connected to the clear switch and the LCD screen; the second circuit board and the clear switch are both arranged on the handwriting pad unit; and the other end of the flexible connection wire is electrically connected to the second circuit board after passing through the second wiring hole.

Furthermore, the handwriting pad unit is connected to the calculator unit through magnetic attraction; the handwriting pad unit is provided with a plurality of third magnetic attraction elements; the third magnetic attraction elements are at least partially arranged close to a peripheral side of the handwriting pad unit; and the calculator unit is provided with fourth magnetic attraction elements attracting the third magnetic attraction elements.

Furthermore, the handwriting pad unit is slidably connected to the calculator unit.

Furthermore, the handwriting pad unit is connected to the calculator unit through a buckle.

Beneficial effects: Compared with the prior art, a function of the handwriting pad can be achieved by adaptive use of the LCD screen and the handwriting pen, so that the user can record data through the LCD screen. By the arrangement of the button module group and the control module on the main body, when the user operates the button module group, the control module can perform the mathematical operation according to a digit and operator corresponding to the button module group to achieve a function of the calculator. When the handwriting pen is detachably connected to the main body, when the user needs to write, the handwriting pend can be directly got. When the handwriting pen does not need to be used, the handwriting pen can be fixed to the main body to prevent the handwriting pen from being lost, making it convenient for the user to carry and store the handwriting pen. Through the above structure, by integrating the function of the calculator with the function of the handwriting pad, the user can easily use them without having to search for them one by one, thereby solving the problem of a tedious operation of finding and getting paper, a pen, and a calculator one by one during existing calculations.

It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the exemplary embodiments described herein. However, it will be understood by those of ordinary skill in the art that the exemplary embodiments described herein may be practiced without these specific details. In other instances, methods, procedures, and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the exemplary embodiments described herein. The drawings are not necessarily to scale and the proportions of certain parts may be exaggerated to better illustrate details and features of the present disclosure.

The term “comprising” when utilized, means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in the so-described combination, group, series, and the like. The disclosure is illustrated by way of example and not by way of limitation in the figures of the accompanying drawings in which like references indicate similar elements. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references can mean “at least one”. In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implying the number of indicated technical features. Thus, the features defined as “first” and “second” may explicitly or implicitly include one or more of the features. In the description of embodiments of the application, “a plurality of” means two or more, unless otherwise specifically defined.

1 28 FIGS.- show a calculator with a handwriting pad according to an embodiment of the present invention.

200 100 300 300 100 200 200 100 200 100 200 100 The calculator with the handwriting pad includes a handwriting pad unit, a calculator unit, and a handwriting pen. The handwriting penis detachably arranged on the calculator unitor the handwriting pad unit, and the handwriting pad unitis connected to the calculator unit. When in a storage state, the handwriting pad unitand the calculator unitare arranged in an overlapped manner from up to down. When in an unfolded state, a surface of the handwriting pad unitis horizontally arranged side by side with the calculator unit.

200 100 300 200 100 200 100 300 200 In this embodiment, the handwriting pad unit, the calculator unit, and the handwriting penare connected together so that the user can directly access them during use without having to search for them one by one. The handwriting pad unitand the calculator unitcan be stacked together when not in use, reducing an overall volume and facilitating carrying and storage when going out. Moreover, the handwriting pad unitand calculator unitcan be arranged horizontally side by side when in use, and in conjunction with the handwriting pen, the user can record data or calculate on the handwriting pad unitfor subsequent calculation or verification using the calculator, making it convenient for the user to use.

200 100 In practical application, the handwriting pad unitis rotationally connected to the calculator unit.

1 12 FIGS.- 223 200 146 100 223 223 146 20 200 100 200 100 200 100 200 100 Referring to, specifically, at least one first rotating partis provided on the handwriting pad unit, and a second rotating partis provided on the calculator unitfor use in conjunction with the first rotating part. The first rotating partis connected to the second rotating partthrough a shaft rodto achieve rotational connection between the handwriting pad unitand the calculator unit. The handwriting pad unitand the calculator unitcan be folded for placement when not in use, and can be unfolded when in use, so as to facilitate the use's use. Of course, in other embodiments, the handwriting pad unitand the calculator unitcan be connected through a hinge, which can also achieve the rotational connection between the handwriting pad unitand the calculator unit.

150 100 230 200 150 150 230 200 100 200 100 200 100 200 150 230 150 230 In a preferred embodiment, at least one first magnetic attraction elementis provided within the calculator unit, and a second magnetic attraction elementis provided on the handwriting pad unitfor use with the first magnetic attraction element. The first magnetic attraction elementis attracted with the second magnetic attraction elementwhen the handwriting pad unitand the calculator unitare in the storage state, so as to achieve position fixation when the handwriting pad unitand the calculator unitare folded and placed, preventing the handwriting pad unitand the calculator unitfrom opening, thereby facilitating storage and carrying. Moreover, other items can be prevented from colliding with a display unit on the handwriting pad unitduring the carrying process, thereby playing a role of protection. One of the first magnetic attraction elementand the second magnetic attraction elementis a magnet and the other is an iron block. Alternatively, both the first magnetic attraction elementand the second magnetic attraction elementare magnets.

13 18 FIGS.- 200 100 200 100 Referring to, in practical application, the handwriting pad unitand the calculator unitcan also be connected by magnetic attraction, which also enables the handwriting pad unitand the calculator unitto be folded and placed when not in use, and be unfolded when in use.

530 200 530 200 100 460 460 530 200 100 530 460 200 100 530 460 200 100 530 460 530 460 Specifically, a plurality of third magnetic attraction elementsare provided on the handwriting pad unit, and at least one part of the third magnetic attraction elementsare positioned near a peripheral side of the handwriting pad unit. The calculator unitis equipped with fourth magnetic attraction elements, and the fourth magnetic attraction elementsare attracted with the third magnetic attraction elements. In this way, when the handwriting pad unitand the calculator unitare unfolded and horizontally arranged side by side, the third magnetic attraction elementsand the fourth magnetic attraction elementsare attracted and fixed to each other. When the handwriting pad unitand the calculator unitare stored and folded, the third magnetic attraction elementsand the fourth magnetic attraction elementscan also be used to attract with each other to fix a relative position of the handwriting pad unitand the calculator unitto prevent opening. The third magnetic attraction elementsare magnets or iron blocks, and the fourth magnetic attraction elementsare magnets. Alternatively, the third magnetic attraction elementsare magnets, and the fourth magnetic attraction elementsare iron blocks.

530 460 530 200 530 460 530 460 In a preferred embodiment, a total number of the third magnetic attraction elementsand a total number of the fourth magnetic attraction elementsare both four. The four third magnetic attraction elementsare respectively arranged near four end corners of the handwriting pad unit. Both the third magnetic attraction elementsand the fourth magnetic attraction elementsare in a long strip shape, so as to enhance the magnetic attraction force of the third magnetic attraction elementsand the fourth magnetic attraction element.

530 100 530 100 530 100 In this embodiment, three of the third magnetic attraction elementsare arranged along a lengthwise direction of the calculator unit, and one of the third magnetic attraction elementsis arranged along a width direction of the calculator unit. Of course, in other embodiments, all the four third magnetic attraction elementscan be arranged along the lengthwise direction or the width direction of the calculator unit.

19 22 FIGS.- 200 100 200 100 Referring to, in practical application, the handwriting pad unitand the calculator unitcan also be connected by sliding, which also enables the handwriting pad unitand the calculator unitto be folded and placed when not in use, and unfolded when in use.

610 200 100 100 610 100 200 200 100 100 100 100 100 Specifically, a sliding slotis provided on a back surface of the handwriting pad unitfor accommodating the calculator unit. When in the storage state, the calculator unitis placed inside the sliding slot, achieving sliding setting between the calculator unitand the handwriting pad unit. That is, the handwriting pad unitcan serve as a sliding cover. When the calculator unitis in use, the sliding cover is placed on the back surface of the calculator unit. When the calculator unitis not in use, the sliding cover serves as a protective cover and is placed in front of the calculator unit, playing a role of protecting the calculator unit.

630 610 620 630 650 100 630 650 640 650 620 630 650 640 620 100 200 200 100 100 200 200 100 In a preferred embodiment, a position limiting convex baris provided on a side wall of the sliding slot, and a second fixing slotis provided on the position limiting convex bar. A position limiting slotis provided on a side wall of the calculator unitfor use in conjunction with the position limiting convex bar. The position limiting slotis positioned near an end of the calculator. A second fixing blockis provided on the position limiting slotfor use in conjunction with the second fixing slot. When in the storage state, the position limiting convex baris placed in the position limiting slot, and the second fixing blockis placed in the second fixing slot, so as to fix a relative position of the calculator unitand the handwriting pad unit. When the user needs to use both the handwriting pad unitand the calculator unitat the same time, the calculator unitcan be pulled out to separate from the handwriting pad unit, so that the handwriting pad unitand the calculator unitcan be arranged horizontally side by side.

200 610 660 100 660 200 200 In a preferred embodiment, the handwriting pad unitprotrudes outward on one side away from the sliding slotto form a supporting convex block. Therefore, when the sliding cover is placed on the back surface of the calculator unit, the supporting convex blockcan support the entire product, preventing a surface of the handwriting pad unitfrom directly contacting a placement surface, thereby preventing the surface of the handwriting pad unitfrom being scratched, paying a role of protection.

23 25 FIGS.- 200 100 200 100 Referring to, in practical application, the handwriting pad unitand the calculator unitcan also be connected in a buckle form, which can also achieved that the handwriting pad unitand the calculator unitcan be folded and placed when not in use, and unfolded when in use.

200 720 100 710 720 720 710 200 100 200 740 100 730 740 730 200 100 Specifically, one side wall of the handwriting pad unitis equipped with connecting fixing blocks, and one side wall of the calculator unitis equipped with fourth fixing slotsfor use in conjunction with the connecting fixing blocks. The connecting fixing blocksare placed inside the fourth fixing slotswhen the handwriting pad unitis connected to the calculator unit. The handwriting pad unitis equipped with a fifth magnetic attraction element. The calculator unitis equipped with a sixth magnetic attraction element. The fifth magnetic attraction elementis attracted with the sixth magnetic attraction elementwhen the handwriting pad unitand the calculator unitare stored.

200 100 720 710 200 100 200 100 740 730 When the handwriting pad unitand the calculator unitare in use, the connecting fixing blocksare placed in the fourth fixing slots, so that the handwriting pad unitand the calculator unitare connected to each other and are arranged horizontally side by side. Moreover, when the handwriting pad unitand calculator unitare stored, the fifth magnetic attraction elementis attracted with the sixth magnetic attraction elementto achieve fixation during folding.

740 730 740 730 720 100 710 200 One of the fifth magnetic attraction elementand the sixth magnetic attraction elementis a magnet and the other is an iron block. Alternatively, both the fifth magnetic attraction elementand the sixth magnetic attraction elementare magnets. Of course, in other embodiments, the connecting fixing blockscan also be provided on side walls of the calculator unit, and the fourth fixing slotscan be defined in the handwriting pad unit, etc.

720 720 200 710 710 720 In one embodiment, a total number of the connecting fixing blocksis four. Two of the connecting fixing blocksare respectively configured on two opposite side walls of the handwriting pad unit. Correspondingly, a total number of the fourth fixing slotsis also four, and each of the fourth fixing slotsis arranged corresponding to a position of one of the connecting fixing blocksto adapt to a usage habit of left-handed writing.

200 100 100 200 100 200 200 100 In the above embodiments, when the handwriting pad unitis connected to the calculator unitthrough rotation, magnetic attraction, buckle, sliding, and other methods, a power supply can be configured only on the calculator unit, and the handwriting pad unitis electrically connected to the calculator unitto achieve power supply to the handwriting pad unit. A separate power supply can also be configured in both the handwriting pad unitand the calculator unit.

1 12 FIGS.- 100 200 10 Referring to, in an embodiment where a power supply is configured on the calculator unitand a power supply is not configured on the handwriting pad unit, the calculator with the handwriting pad further includes a flexible connection wire.

100 170 173 170 200 210 100 30 200 200 40 100 10 30 40 10 100 170 10 200 210 200 100 173 170 170 210 10 The calculator unitis equipped with a first circuit boardand a first clear switchelectrically connected to the first circuit board. The handwriting pad unitis equipped with a first liquid crystal display (LCD) screen. The calculator unitis provided with a first wiring holeon one side near the handwriting pad unit. The handwriting pad unitis provided with a second wiring holeon one side near the calculator unit. The flexible connection wirepasses through the first wiring holeand the second wiring hole. One end of the flexible connection wireis placed inside the calculator unitand soldered to the first circuit board, and an opposite end of the flexible connection wireis placed inside the handwriting pad unitand soldered to the first LCD screen, thereby electrically connecting the handwriting pad unitto the calculator unit. When the first clear switchis operated, an electrical signal will be fed back to the first circuit board. The first circuit boardwill clear the content displayed on the first LCD screenthrough the flexible connection wire.

100 180 160 120 130 170 120 160 180 170 170 160 170 210 170 10 180 170 120 160 100 160 130 100 The calculator unitis equipped with a first battery, a second circuit board, a first display, and a first button module group. The first circuit boardand the first displayare both electrically connected to the second circuit board, and the first batteryis electrically connected to the first circuit board, so as to provide power to the first circuit board. The power is also supplied to the second circuit boardthrough the first circuit board, and to the first LCD screenthrough the first circuit boardand the flexible connection wire. The first battery, the first circuit board, and the first displayare all positioned above the second circuit board, so that the layout is reasonable, and a volume of the calculator unitcan be effectively reduced. The second circuit boardperforms a calculation on input data when the first button module groupis operated, so as to achieve a function of the calculator unitand facilitate the user's operation and calculation.

100 171 170 170 171 170 210 10 210 173 In one embodiment, the calculator unitis further equipped with a first locking switchelectrically connected to the first circuit board. When the first circuit boardreceives an electrical signal fed back by the first locking switch, the first circuit boardlocks the content displayed on the first LCD screenthrough the flexible connection wire, so as to prevent the user from clearing the content on the first LCD screenwhen accidentally operating the first clear switch.

30 40 200 100 10 10 In one embodiment, a side wall of the first wiring holeand/or a side wall of the second wiring holealong a lengthwise direction are/is smooth curved surface(s). Therefore, when the handwriting pad unitand the calculator unitare rotated, friction and creases on the flexible connection wirecan be effectively reduced, and a service life of the flexible connection wirecan be extended.

170 30 30 30 40 40 40 210 170 210 10 10 200 100 10 10 170 210 10 10 In one embodiment, a total sum of a distance between a bottom surface of the first circuit boardand the first wiring hole, a width of the first wiring hole, a distance between the first wiring holeand the second wiring hole, a width of the second wiring hole, and a distance between the second wiring holeand the first LCD screenis a first length. After a part welded to the first circuit boardand a part welded to the first LCD screenare deducted from the flexible connection wire, a remaining length of the flexible connection wireis greater than the first length. Therefore, when the handwriting pad unitrotates relative to the calculator unit, the flexible connection wireis not folded at a position along a single line, but with a certain area, thereby further improving the service life of the flexible connection wire. Specifically, after the part welded to the first circuit boardand the part welded to the first LCD screenare deducted from the flexible connection wire, the remaining length of the flexible connection wireis 1 mm longer than the first length.

173 300 320 170 210 10 210 300 In one embodiment, the first clear switchis a Hall switch. An end of the handwriting penis provided with a magnetic field magnetfor generating a magnetic field. When the first circuit boardreceives an electrical signal fed back by the Hall switch, the content displayed on the first LCD screenis cleared through the flexible connection wire. Therefore, when the user needs to clear the content on the first LCD screen, the end of the handwriting pencan be placed close to the Hall switch.

100 110 110 160 180 110 160 160 110 180 170 In one embodiment, the calculator unitis equipped with a first photovoltaic panel. The first photovoltaic panelis electrically connected to the second circuit board. The first batteryis a rechargeable battery. The first photovoltaic panelis configured for converting light energy into electrical energy and transmitting the electrical energy to the second circuit board. The second circuit boardis configured for processing the electrical energy transmitted by the first photovoltaic paneland then storing the electrical energy into the first batterythrough the first circuit board, thereby saving resources.

110 120 130 110 120 130 Specifically, the first photovoltaic panelcan be positioned between the first displayand the first button module group, or the first photovoltaic panelcan also be positioned on one side of the first displayaway from the first button module group.

26 28 FIGS.- 170 80 50 80 160 180 50 80 180 80 180 80 110 110 180 50 173 210 50 173 50 80 210 210 Referring to, in one embodiment, the first circuit boardis integrated with a power circuitand a boost module. The power circuitis respectively electrically connected to the second circuit board, the first battery, and the boost module. The power circuitcan be used for connecting to external power supply, so as to charge the first battery. The power circuitcan also be used for managing the charging and discharging of the first battery. The power circuitcan also be electrically connected to the first photovoltaic panelto process the electrical energy converted from light energy by the first photovoltaic paneland then store the electrical energy into the first battery. The boost moduleis respectively electrically connected to the first clear switchand the first LCD screen. In this way, when the boost moduledetects the electrical signal fed back by the first clear switch, the boost moduleboosts the voltage output by the power circuitand then transfers the boosted voltage to the first LCD screento clear the content on the first LCD screen.

50 1 1 1 1 1 5 2 3 2 4 5 6 9 3 4 7 5 8 Specifically, the boost moduleincludes a boost chip U, a first inductor L, a first diode D, a first transistor Q, a first resistor R, a first capacitor C, a second resistor R, a third resistor R, a second transistor Q, a fourth resistor R, a fifth resistor R, a sixth resistor R, a ninth resistor R, a third transistor Q, a fourth transistor Q, a seventh resistor R, a fifth transistor Q, an eighth resistor R, and a connection interface WLCD.

1 2 1 1 1 1 5 2 2 3 4 1 1 6 9 1 1 1 1 1 4 7 1 5 8 1 5 2 2 2 3 2 3 4 3 3 5 3 4 2 4 4 5 1 4 5 2 3 A model of the boost chip Ucan be SAP. A first pin of the boost chip Uis connected to a collector electrode of the first transistor Qthrough the first inductor L. The collector electrode of the first transistor Qis connected to the first capacitor C, the second resistor R, a first pin of the second transistor Q, a third pin of the third transistor Q, and the fourth resistor Rrespectively after passing through the first diode D. A second pin of the boost chip Uis connected at a connection between the sixth resistor Rand the ninth resistor R. A fifth pin of the boost chip Uis connected to a base electrode of the first transistor Qthrough the first resistor R. A sixth pin of the boost chip Uis connected to a base electrode of the fourth transistor Qthrough the seventh resistor R. A seventh pin of the boost chip Uis connected to a base electrode of the fifth transistor Qthrough the eighth resistor R. An emitter electrode of the first transistor Qand one end of the first capacitor Care grounded. Two ends of the second resistor Rare respectively connected to a base electrode of the second transistor Qand a collector electrode of the second transistor Q. Two ends of the third resistor Rare respectively connected to the base electrode of the second transistor Qand a collector electrode of the third transistor Q. Two ends of the fourth resistor Rare respectively connected to a base electrode of the third transistor Qand an emitter electrode of the third transistor Q. Two ends of the fifth resistor Rare respectively connected to the base electrode of the third transistor Qand a collector electrode of the fourth transistor Q. The collector electrode of the second transistor Qis electrically connected to the collector electrode of the fourth transistor Q. An emitter electrode of the fourth transistor Qand an emitter electrode of the fifth transistor Qare both grounded. The first transistor Q, the fourth transistor Q, and the fifth transistor Qare all NPN type transistors. The second transistor Qand the third transistor Qare PNP type transistors.

173 1 80 1 173 1 When the first clear switchis the Hall switch, the first pin of the boost chip Uis further connected to the power circuitand a first pin of the Hall switch, and a third pin of the Hall switch is connected to a third pin of the boost chip U. When the first clear switchis a button switch, one end of the button switch is connected to the third pin of the boost chip U, and an opposite end of the button switch is grounded.

210 6 9 3 4 The connection interface WLCD is configured for connecting the first LCD screen. A first pin of the connection interface WLCD sequentially passes through the sixth resistor Rand the ninth resistor R, and then is connected to the collector electrode of the third transistor Q. A second pin of the connection interface WLCD is connected to the collector electrode of the fourth transistor Q.

1 1 1 1 1 1 2 4 210 210 When the button switch is turned on, a voltage on the third pin of the boost chip Uis reduced. Alternatively, when the boost chip Udetects a voltage fed back by the Hall switch, the boost chip Uoutputs a voltage of a certain frequency to the first transistor Qthrough the first resistor R, and a return circuit (loop) of the first inductor Lis utilized to achieve voltage boost. Then, through a return circuit (loop) of the second transistor Qand the fourth transistor Q, the boosted voltage is output to the first LCD screenthrough the connection interface WLCD, so as to clear the content on the first LCD screen.

1 12 FIGS.- 180 172 170 100 143 1434 143 180 1434 143 100 180 170 180 172 180 143 100 180 143 Referring to, in one embodiment, the first batteryis a button battery, and an arched first conductive sheetis provided on the first circuit board. The calculator unitis detachably equipped with a first pulling element, and a first receiving slotis defined in the first pulling element. The first batteryis positioned in the first receiving slot. When the first pulling elementis partially placed inside the calculator unit, one surface of the first batteryabuts against a solder pad on the first circuit board, and an opposite surface of the first batteryabuts against the first conductive sheet. Therefore, when the first batteryruns out of battery, the user can remove the first pulling elementfrom the calculator unitto replace the first battery, and then install the first pulling element, so as to improve a service life of the product in this embodiment.

143 100 1434 143 1431 1434 1433 1431 100 1432 1433 1433 1432 143 100 143 100 143 143 100 143 143 143 100 Specifically, the first pulling elementis fixed to the calculator unitby a screw at one end of the first receiving slot. The first pulling elementis provided with a first elastic elementat an opposite end of the first receiving slot. A first fixing blockis provided on the first elastic element. The calculator unitis provided with a first fixing slotat a position corresponding to the first fixing block. The first fixing blockis placed in the first fixing slotwhen the first pulling elementis installed on the calculator unit. That is, one side of the first pulling elementis fixed to the calculator unitin a form of a buckle, and an opposite side of the first pulling elementis fixed with the screw, so as to stably fix the first pulling elementon the calculator unit. When the first pulling elementneeds to be disassembled, the screw can be unscrewed, and then the first pulling elementis pulled with force, so that the the first pulling elementis removed from the calculator unit.

143 1433 1432 1433 1432 1433 1432 In one embodiment, in order to facilitate the disassembly and assembly of the first pulling element, a side surface of the first fixing blockand a side surface of the first fixing slotare inclined surfaces, so that the first fixing blockcan be placed inside the first fixing slot, and the first fixing blockcan also be easily detached from the first fixing slot.

100 140 140 142 141 142 141 142 141 30 146 142 130 142 171 170 173 160 160 170 173 170 170 120 120 142 143 142 180 170 142 170 130 100 142 149 320 In the above embodiments, the calculator unitincludes a third outer housing. The third outer housingincludes a third front housingand a third bottom housing. The third front housingand the third bottom housingcan be connected by a buckle or a screw. The third front housingis connected to the third bottom housingto form the first wiring hole. The second rotating partand the third front housingare integrally formed by injection molding. The first button module groupis positioned on the third front housing. The first locking switchis arranged on the first circuit board. The first clear switchis arranged on the second circuit board. By electrically connecting the second circuit boardto the first circuit board, the first clear switchis electrically connected to the first circuit board. The first circuit boardis positioned behind the first display. The first displayis arranged on the third front housing. The first pulling elementis locked on the third front housingthrough the screw. The first batteryis positioned on one side of the first circuit boardnear the third front housing. The first circuit boardis equipped with a first switch button. By operating the first button module, the calculator unitcan be turned on for numerical calculation. The third front housingis equipped with a through holeat a position corresponding to the Hall switch, so that the Hall switch can detect the magnetic field generated by the magnetic field magnet.

200 220 220 222 221 222 221 222 221 40 223 222 The handwriting pad unitincludes a fourth outer housing. The fourth outer housingincludes a fourth front housingand a fourth bottom housing. The fourth front housingcan be connected to the fourth bottom housingby a buckle or a screw. The fourth front housingis connected to the fourth bottom housingto form the second wiring hole. The first rotating partand the fourth front housingare integrally formed by injection molding.

142 223 148 222 146 60 223 146 146 60 223 148 100 200 The third front housingis recessed at a position corresponding to the first rotating partto form a first avoidance slot, and the fourth front housingis recessed at a position corresponding to the second rotating partto form a second avoidance slot. When the first rotating partis connected to the second rotating part, the second rotating partis at least partially placed inside the second avoidance slot, and the first rotating partis at least partially placed inside the first avoidance slot, thereby reducing a thickness of the calculator unitand the handwriting pad unitwhen in the storage state.

180 100 10 200 200 200 210 200 In the above embodiments, the first batteryis only configured inside the calculator unit, and the flexible connection wireis used for controlling the handwriting pad unitand powering the handwriting pad unit. Moreover, the handwriting pad unitis not equipped with a battery, a circuit board, a clear switch, and a locking switch, which can maximize a volume of the first LCD screenand increase a handwriting area, thereby improving the user experience of the handwriting pad unit.

222 224 210 210 224 130 142 100 200 130 142 224 150 230 100 200 In one embodiment, the fourth front housingis provided with a second display openingat a position corresponding to the first LCD screen, so that the user can write on the first LCD screen. A height of a side wall of the second display openingis equal to or greater than a height of the first button module groupprotruding from an outer side of the third front housing. Therefore, when the calculator unitand the handwriting pad unitare folded and stored, the first button module groupprotruding from the outer side of the third front housingcan be placed on the side wall formed by the second display opening, so that the first magnetic attraction elementcan attract with the second magnetic attraction element, and the calculator unitcan abut against a surface of the handwriting pad unit.

147 140 300 300 147 300 300 310 311 140 310 300 147 310 In one embodiment, a storage slotis provided on the third outer housingfor storing the handwriting pen. When the handwriting penis placed in the storage slot, the handwriting penis fixed through a buckle structure. Specifically, a top portion of the handwriting penis equipped with a friction convex block. A windowis defined in the third outer housingat a position corresponding to the friction convex block. The user can remove the handwriting penfrom the storage slotby moving the friction convex block, making it convenient for the user to use.

200 100 222 221 70 530 70 530 142 141 443 460 443 460 530 222 221 460 142 141 530 220 460 140 When the handwriting pad unitis connected to the calculator unitby magnetic attraction, the fourth front housingis connected to the fourth bottom housingto form a first installation slot. The third magnetic attraction elementsare arranged inside the first installation slot, so that the third magnetic attraction elementsare fixed. The third front housingis connected to the third bottom housingto form second installation slots. The fourth magnetic attraction elementsare arranged inside the second installation slots, so that the fourth magnetic attraction elementsare fixed. In other embodiments, the third magnetic attraction elementscan also be fixed to the fourth front housingor the fourth bottom housingby injection molding. The fourth magnetic attraction elementscan also be fixed to the third front housingor the third bottom housingby injection molding. Alternatively, the third magnetic attraction elementscan be fixed to the fourth outer housingby using a buckle or by gluing, and the fourth magnetic attraction elementscan also be fixed to the third outer housingby using a buckle or by gluing.

15 18 FIGS.- 200 100 200 520 540 560 510 560 540 510 520 510 540 560 560 510 523 520 510 540 560 510 560 562 520 524 562 524 562 560 562 560 510 510 524 Referring to, when the handwriting pad unitand calculator unitare both internally configured with a separate power supply, the handwriting pad unitincludes a first outer housing, a second battery, a third circuit board, and a second liquid crystal display (LCD) screen. The third circuit board, the second battery, and the second LCD screenare all arranged inside the first outer housing. The second LCD screenand the second batteryare both electrically connected to the third circuit board. The third circuit boardis positioned above or below the second LCD screen. A first display openingis defined in a surface of the first outer housingat a position corresponding to the second LCD screen. The second batterycan provide power to the third circuit boardand the second LCD screen. The third circuit boardis equipped with a second clear switch. The first outer housingis equipped with a first pressing elementat a position corresponding to the second clear switch. The first pressing elementis connected to the second clear switch. When the third circuit boarddetects an electrical signal fed back by the second clear switch, the third circuit boardcontrols the second LCD screento clear the displayed content. Therefore, when the user needs to clear the content on the second LCD screen, the first pressing elementcan be operated and pressed.

561 560 525 520 561 525 561 560 561 510 510 525 In one embodiment, a second locking switchis provided on the third circuit board. A first operating elementis arranged on the first outer housingat a position corresponding to the second locking switch. The first operating elementis connected to the second locking switch. When the third circuit boarddetects an electrical signal fed back by the second locking switch, the content displayed on the second LCD screenis locked. Therefore, when the user needs to lock the content on the second LCD screenfrom being accidentally cleared, the first operating elementcan be operated and pressed.

561 524 520 523 561 520 Specifically, the second locking switchis a dual in-line package (DIP) switch. The first pressing elementis positioned on a surface of the first outer housingequipped with the first display opening, and the second locking switchis positioned at a top portion of the first outer housing.

520 550 551 550 563 560 540 540 551 550 520 551 520 563 540 563 540 560 540 550 520 540 550 In one embodiment, the top portion of the first outer housingis detachably provided with a second pulling element. A second receiving slotis defined in the second pulling element. A second conductive sheetin an arched shape is provided on the third circuit board. The second batteryis a button battery, and the second batteryis installed on the second receiving slot. When the second pulling elementis assembled onto the first outer housing, the second receiving slotis placed inside the first outer housingand below the second conductive sheet. One surface of the second batteryabuts against the second conductive sheet, and an opposite surface of the second batteryabuts against a solder pad on the third circuit board. When the second batteryruns out of power, the user can remove the second pulling elementfrom the first outer housingto replace the second battery, and then install the second pulling element, so as to improve the service life of the product in this embodiment.

550 520 550 552 551 520 554 552 552 554 550 520 550 520 550 550 520 550 550 550 520 Specifically, one end of the second pulling elementis fixed to the first outer housingby a screw. The second pulling elementis provided with a third fixing blockon a side wall corresponding to the second receiving slot. The first outer housingis provided with a third fixing slotat a position corresponding to the third fixing block. The third fixing blockis placed in the third fixing slotwhen the second pulling elementis installed on the first outer housing. That is, one side of the second pulling elementis fixed to the first outer housingin a form of a buckle, and an opposite side of the second pulling elementis fixed by a screw, so as to stably fix the second pulling elementon the first outer housing. When the second pulling elementneeds to be removed, the screw can be unscrewed, and then the second pulling elementis forcefully pulled, so as to remove the second pulling elementfrom the first outer housing.

550 552 554 552 554 552 554 In one embodiment, in order to facilitate the disassembly and assembly of the second pulling element, a side surface of the third fixing blockand a side surface of the third fixing slotare inclined surfaces, so that the third fixing blockcan be placed inside the third fixing slot, and the third fixing blockcan also be easily detached from the third fixing slot.

100 440 410 450 430 480 450 480 410 440 430 440 450 480 410 450 480 410 450 450 430 480 450 100 430 The calculator unitincludes a second outer housing, a second display, a fourth circuit board, a second button module group, and a third battery. The fourth circuit board, the third battery, and the second displayare all positioned inside the second outer housing. The second button module groupis positioned on the second outer housingand corresponds to the fourth circuit board. The third batteryand the second displayare both electrically connected to the fourth circuit board. The third batteryand the second displayare both positioned above the fourth circuit board. The fourth circuit boardcalculates the input data when the second button module groupis operated. The third batterycan provide power to the fourth circuit board, and the calculator unitcan be turned on by operating the second button module group, so as to perform numerical calculation.

100 420 420 450 480 420 450 450 420 480 450 480 In one embodiment, the calculator unitis equipped with a second photovoltaic panel. The second photovoltaic panelis electrically connected to the fourth circuit board. The third batteryis a rechargeable battery. The second photovoltaic panelis configured for converting light energy into electrical energy and transmitting the electrical energy to the fourth circuit board. The fourth circuit boardis configured for processing the electrical energy transmitted by the second photovoltaic panel, and then the electrical energy is stored into the third batterythrough the fourth circuit board, so as to improve the service life of the third batteryand save resources.

440 470 480 470 471 450 451 480 480 471 470 440 471 440 451 480 451 480 450 480 470 440 480 470 In one embodiment, a top portion of the second outer housingis detachably equipped with a third pulling elementat a position corresponding to the third battery. The third pulling elementis provided with a third receiving slot. The fourth circuit boardis provided with an arched third conductive sheet. The third batteryis a button battery. The third batteryis installed on the third receiving slot. When the third pulling elementis assembled onto the second outer housing, the third receiving slotis placed inside the second outer housingand below the third conductive sheet. One surface of the third batteryabuts against the third conductive sheet, and an opposite surface of the third batteryabuts against a solder pad on the fourth circuit board. When the third batteryruns out of battery, the user can remove the third pulling elementfrom the second outer housingto replace the third battery, and then install the third pulling element, so as to improve the service life of the product in this embodiment.

29 FIG. 30 FIG. 100 200 100 200 Referring toand, in other embodiments, the calculator unitand the handwriting pad unitmay be arranged in an overlapped manner from up to down when not in storage. Namely, the calculator unitand the handwriting pad unitare integrated and in a straight state.

100 200 800 300 800 850 800 850 170 820 810 850 840 830 800 850 820 810 840 300 830 850 840 When the calculator unitand the handwriting pad unitare integrated, the calculator with the handwriting pad includes a main body. A handwriting penis detachably arranged on the main body. A control moduleis arranged on the main body. The control moduleis equivalent to the first circuit board. A third button module groupfor being operated by a user, a third displayelectrically connected to the control module, a third LCD screen, and a third clear switchare arranged on the main body. The control moduleperforms a mathematical operation when the user operates the third button module groupand displays an operation result through the third display. The third LCD screenis configured to adapt to the handwriting penfor writing use, and the third clear switchis configured to be operated by the user and generate a clear signal. The control moduleis configured to receive a clear signal and clear, according to the clear signal, content displayed on the third LCD screen.

840 300 840 820 850 800 820 850 820 300 800 300 300 300 800 300 830 840 In this embodiment, a function of the handwriting pad can be achieved by adaptive use of the third LCD screenand the handwriting pen, so that the user can record data through the third LCD screen. By the arrangement of the third button module groupand the control moduleon the main body, when the user operates the third button module group, the control modulecan perform the mathematical operation according to a digit and operator corresponding to the third button module groupto achieve a function of the calculator. When the handwriting penis detachably connected to the main body, when the user needs to write, the handwriting pendcan be directly got. When the handwriting pendoes not need to be used, the handwriting pencan be fixed to the main bodyto prevent the handwriting penfrom being lost, making it convenient for the user to carry and store the handwriting pen. Through the above structure, by integrating the function of the calculator with the function of the handwriting pad, the user can easily use them without having to search for them one by one, thereby solving the problem of a tedious operation of finding and getting paper, a pen, and a calculator one by one during existing calculations. Finally, in this embodiment, by the arrangement of the third clear switch, the content displayed on the third LCD screencan be cleared during operation by the user, so that the user can use the calculator repeatedly.

800 870 850 870 850 840 830 840 In the embodiment where the calculator unit and the handwriting pad unit are integrated, the main bodyis further provided with a third locking switchelectrically connected to the control module. The third locking switchis configured to be operated by the user and generate a locking signal. The control moduleis configured to: receive the locking signal and lock, according to the locking signal, the content displayed on the third LCD screen, to prevent the user from accidentally operating the third clear switchto clear the content on the third LCD screen.

830 300 320 850 840 300 840 830 The third clear switchcan be a Hall switch. An end of the handwriting penis provided with a magnetic field magnetfor generating a magnetic field. When detecting a magnetic field, the Hall switch generates a clear signal. The control moduleclears, according to the signal, the content displayed on the third LCD screen. Thus, the user can make the end of the handwriting penapproach the Hall switch when the content on the third LCD screenneeds to be cleared. Certainly, in other embodiments, the third clear switchmay also be a switch button, a touch switch, a toggle switch, and the like.

100 200 180 800 850 180 850 180 In the embodiment where the calculator unitand the handwriting pad unitare integrated, a batteryis further arranged in the main body, and the control moduleis electrically connected to the battery. The control moduleis powered by the battery, which eliminates a tedious operation of connecting a power cable to an external power supply and is convenient for carrying and use when the user goes out.

100 200 800 850 180 850 180 800 180 180 In the embodiment where the calculator unitand the handwriting pad unitare integrated, the main bodyis provided with a charging port that is electrically connected to the control module, to connect an external power supply. The batteryis charged through the control module. Or, in other embodiments, the batteryis detachably arranged on the main bodyso that it is convenient to replace the batterywhen the batteryruns out of power.

100 200 820 810 840 820 830 820 840 810 820 840 In the embodiment where the calculator unitand the handwriting pad unitare integrated, the third button module groupis located below the third display, and the third LCD screenis located on a left or right side of the third button module group. The third clear switchcan be located below the third button module group, or located above, below, or on a left or right side of the third LCD screen. Certainly, in other embodiments, the third displaymay also be located below the third button module group, or above or below the third LCD screen, or at another position.

800 801 802 801 880 820 840 830 810 801 850 880 300 801 802 880 Specifically, for the convenience of production and manufacturing of the calculator in this embodiment, the main bodyincludes a front housingand a bottom housingconnected to the front housingto form a cavity. The third button module group, the third LCD screen, the third clear switch, and the third displayare all arranged in the front housing. The control moduleis arranged in the cavity. The handwriting penis detachably arranged in one of the front housing, the bottom housing, and the cavity.

The above description only describes embodiments of the present disclosure, and is not intended to limit the present disclosure; various modifications and changes can be made to the present disclosure. Any modifications, equivalent substitutions, and improvements made within the spirit and scope of the present disclosure are intended to be included within the scope of the present disclosure